Induction or ignition coil



July l, 1924. 1,499,931

E. B. JAcoBsoN INDUCTION ORl IGNITION COIL Filed April l5, 1922 imA am lINVENTOR. Edward B Jacosa?.

BY va/vzy/W ATTORNEY Patented July l, 1924.

UNITED STATES EDWARD B. JACOBSON, OF PITTSFIELD, MASSACHUSETTS.

INDUCTION OR IGNITION COIL.

Application filed `April 15, 1922. Serial No. 553,230.

T0 all whom t may concern.

Be it known that I, EDWARD B. JAooBsoN, a citizen of the United Statesof America, residing at Pittsfield7 in the county of Berkshire andStateof Massachusetts, have invented certain new and useful Improvements inInduction or Ignition Coils, of which the following is a specification.

This invention relates to improvements in induction coils.

An object of the invention is to provide an induction or spark coil foruse in connection with the ignition system of a motor vehicle, thecurrent from the secondary winding of which is connected to the usualspark plugs of an internal combustion engine.

A further object is to provide an induction coil in which the currentproduced in the secondary is of greater amperage than in the coils nowin use7 whereby a more'eificient ignition of a vaporous charge isproduced.

A further object is to provide an induction coil in which the magneticcircuit is more nearly a closed one whereby greater efliciency isproduced.

A further object is to so construct and arrange the various elements orparts of the coil in order that itmay be readily taken apart andreassembled, if necessary, for repairs. Y

Further objects and nature of the invention will appear in the body ofthe specicae tion and will be particularly pointed out in the appendedclaims.

Referring to the drawings which form a part of the specification.

Fig. 1 is a plan view of the cover plate for closing the upper end ofthe casing and showing the primary terminals.

Fig. 2 is a vertical sectional view on the line 2 2 of Fig. 1 showingthe cups of molded insulation between which the two coils are located,also the manner of securing the bedded within the molded insulation topor.

cover plate. f

Fig, 6 is a detail side elevational and end view respectively of thehigh tension terminal. Y l

Fig. 7 is a detail end andside elevational view respectively of theinteriorly threaded nut which is connected to the tie rod.

Fig. 8 is a detail top plan and side elevational view respectively ofthe attaching bottom stud for the securing of the coil.

Fig. 9 is a sectional view of the molded insulating top'or cover plateand Fig. 10 is a detail view of one of the discs of magnetic material.

Referring to the drawings in detail:

1 and 2 designate the primary and secondary windings respectively, 3 theusual core of any suitable construction and material as wires of soft orannealed iron. 4@ and 5 are the upper'and lowercup members of moldedinsulating material and between which the primary and secondary coils 1and 2 are placed, as shown.' The ends of these coils fit within thedepressions 6 and 7 which are formed by the elongated flanges 8. Themargins 9 produce the depressions 10, and, molded with and locatedwithin each of the depressions 10 are the perforated tubular portions 11through which passes the two terminals 12 and 13 ofA the primary coil 1.

Located within the depression 10 of each of the cup members 4 and 5 arediscs 14 of thin magnetizable material 'having openings 15 to 'receivethe tubular portions 11. and a radially arranged opening or slot- 16which connects at its inner end with the curved seat portion 17 in whichis located the tie rod 18. These discs engage or are in direct contactwith the opposite ends of the core 3, as shown. A good magnetic contactis therefore produced. 19 designates discs of insulating material whichare placed .within each of the depressionsl() and on the outermost oneof the metallic discs 14 which compose the core heads.

The core 3, primary and secondary coils 1 and 2, cups 4 and 5, discs 14;and19 are secured together and in place as follows:

The tie rod 18 is threaded as indicated at 2O to receive the interiorlythreaded bottom stud 21. The end 21 of this stud engages the lower discof insulation 19 and forces the metallic discs 14 against the lower endof the core 3 and against the bottom of the recess 10 of the lower cup5. r1`he opposite or upper end of the rod- 18 is also threaded asindicated at. 22. On thisvrod is placed the loose sleeve or washer 23which rests on the outer surface of the upper fibre disc 19. Engagingthe threads 22 is an internally threaded sleeve er1-11.11.1524; (sesFig, which formed cap or top piece 26 of molded insulating ma-V withslots 24 to receive a screw driver. ThisV sleeve is located within asecond sleeve 25Y (see Fig. 5) which is embedded within the tei'ial, asclearly shown in Figs. and 9. The lower edge 242 engages the inclinedannular shoulder 27 of the sleeve 25 and when the sleeve or nut 24 isrotated it will firmly clamp lor draw the two cup shaped members 4 and 5together, and will also irmly draw the metallic discs 14, which composethe core headV against the,ends of theAcorerB. This operation also irmlyconnects tthe Vcap or top piece 26 to the tie rod 18.

The piece 25 is formed with anmternally Y formed t-hread 25 forattaching the Vcoil to a support. In the cap piece 26 isembedded the twoterminals 28 to which the two ter'- minals 29 ofthe primary coil 1Y areconinected.

30 are theset screws for' connecting the coil lV tov a suitable. sourceot electrical energy. Y

The parts of theV coil are enclosed by means of the fibre Vcasing 30which is preierably'water and oil proof. This casing is attached to the'base ,piece 31 byrmeans of the pins 32. The piece 31 is secured to thetie rod 18 by means of the stud 21 shown in F ig. 8. 32 is a hightension button terminal to which the cable is connected that conveysl inthe use of the two cuprshaped members 4 and 5, and the core heads whichare formed of the metallic dises 14.

The cup. members are formed with a centrally disposed opening 4 toreceivefthe.

ends of the coreA 3, as shown. VvThat I claim is;` Y

1. In an induction coil, the combination,

a core, primaryY and secondary Vcoils thereon, clampingA Ymemberstherefor, said members ,beingaformed with recesses ontheir innersurfaces to receive the ends of the coils, and

tubular projections communicating with the recesses to receive theterminals of the lprimary winding and other recesses formedand locatedon the outer ends of the members,

metallicV members locatedzonY the said other recesses fordistributingthe magnetic iluX from the core, atie rod and means thereon Vfordrawingthe clamping members toward Yeach other. Y j 2. A cap or closurefor one end of an induction coil comprising amember Vformed of moldedinsulating material, terminals Vvformed with flanges which arelocated inthe Vsaid material for ,receiving thejrendsof the .primary f coil, alcentrally disposed interiorly vthreaded sleeve formed lwith flanges endals@ 'located in the Said material and :pieces having an' interiorlythreaded-part riorly threaded nut engaging the threads of the sleeve anda part engaging the shoulder thereof, the said nut having interiorlylocatedfthreads Vfor engaging the threads on the rod, whereby when thenutis threaded intothe sleeve against the shoulderthe tie rod may betightened. Y

3. In an inductionfcoil, the combination of a member forclamping thecoreand the primary and secondary coils of an induction coil, saidmember having depressions on its opposite faces, the depressions ontheir'sin'i i ner faces being for directly receivingA the ends of said'coils,metallic discs located in theV depressions on their outer Afaces'and which directly engage the ends ofthe core, -a tie rod, means on therod engaging theV discs for drawing the whole together.V

4; An induction coil, comprising a core'.` primary and secondary coilsthereon, of 71a" pair of recessed coil clamping membersto receivetheends of the coils,me'ans for drawf ingV the members againstY the ends ofthe coils, said members having an openingto'r receive the ends of thecore, magnetizable pieces formed with openings and directly engaginglthe ends ,of the core and located, on the recessedV clamping members,theresoY cessed members having tubular projections V which enteropenings in the magnetizable" pieces. p

5. An induction coil comprising a core, a primary and aV secondary coilarranged about said core,.a member composed of insulating material andeach formed with a centrally disposed openinginto which the ends ofthecore projects, each member hav. ing oppositely disposed recesses,thelrecessesV on one side Vof each member receiving the 1 ends of thesaid coils, each memberv having perforated projections to receive theends of the primary coil, metallic diskshaped plates formed Vwithopenings to receive the projec-Y tions of each of said members, andlocated in theFGCQSSGS'OHtheouterends@reach afraid` Y members, saidplates each having a radially arrangedjopening. and means for vclampingilo' the members in place comprisinga tie rod'Y A whichis located intherradially arranged f openingV j Y A Y Y Y Y An induction `coilcomprising a1k core" primary and secondary windings'thereon, a

member atgeacliend of thecoils and engagfV Y@ Y Y Vingthe same and eachAformed with recesses,

an enclosing casing, Va closurefpiece ateacli end of the casing,metallic. disk-shaped'mein;

bers engaging the ends .of the core, piecesof insulation on theoutermostfone of the metallic disk shaped pieces, a tie bolt connectedto the closure pieces, one of the closure therein and a flange partengaging the piece of insulation at one end of the coreJ the other orupper Closure piece having an interiorly threaded part therein, a nuthaving threads on its interior and exterior and engaging the threads ofthe interiorly threaded part in the upper closure piece, a tie rodhaving threads at each end which is threaded into the threads of the rstmentioned elo- 10 sure piece, its other threaded end being engaged bythe internal threads of said nut, a washer on the rod and engaging thepiece of insulation at the upper end of the core, whereby when the nutis tightened the c10- sure pieces will be secured to the easing and themetallic disk-shaped pieces forced against the ends of the core and saidmembers at each end of the Coils will be forced towards the ends of thecoils.

EDWARD B. JACOBSON.

